Report when Buildbox-casd is not alive at the end of a run

Benjamin Schubertrequested to merge
bschubert/ensure-buildbox-alive into master

Description

If Buildbox-casd crashes, it can be hard to understand why BuildStream failed.

This adds a patch to ensure, when we stop Buildbox-casd, that it was still sane, and will report a message otherwise.

Edited by Benjamin Schubert

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